空间目标双基地ISAR越多普勒单元徒动校正算法

doi:10.3969/j.issn.1000-436x.2014.09.021

Abstract

Abstract:

Aiming at the problem of migration through Doppler cells in bistatic ISAR,based on bistatic ISAR turntable model,the reason of migration through Doppler cells from two aspects of echo model and the relative speed changes of scattered points was analyzed.The correction algorithm was presented based on range cell phase compensation.Firstly,target rotating rate was estimated through the geometrical relationship of bistatic stations and target.Secondly,the algo-rithm divided the echo data into two parts,and then imaging separately,getting two images of different angles of view.And the rotating center was estimated according to the maximum criterion of rotating correlation,which was used to range scaling.The migration through Doppler cells was corrected through phase compensation of each range cell at last.The simulation result show that the method could solve the problem of migration through Doppler cells,and could im-prove the image quality.

Key words: bistatic, ISAR, migration through Doppler cells, equivalent rotating rate estimation, equivalent rotating cen-ter estimation

Bao-feng GUO,Chao-xuan SHANG,Xin WANG,Jun-tao MA,Jian DONG. Correction algorithm of migration through Doppler cells for space target in bistatic ISAR[J]. Journal on Communications, 2014, 35(9): 197-206.

Figures/Tables 13

References 22

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参数名称	参数值	参数名称	参数值
载频	10 GHz	距离分辨率	0.335 m
带宽	400 MHz	方位分辨率	0.137 m
脉冲重复频率	50 Hz	平动补偿	累积互相关
脉冲积累数	256个	相位校正	多特显点
累积转角	7.0°

ISAR二维像	图像对比度
未校正图像	10.13
越距离单元校正后图像	10.42
越多普勒单元校正后图像	11.71

Correction algorithm of migration through Doppler cells for space target in bistatic ISAR

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